Process of obtaining gases for heating purposes.



.iern nD sTA'rEs PATENT, onnrss.

EMIL KNOEVENAGEL, OF HEIDELIBEBG, GERMANY, ASSIGNOR"TO THE FIRM OF ATHION, GESELLSCHAFT MIT BESCHRANK'IERXHAFTUNG, F -MA'NNI-IEIM- WALDI-IOF, GERMANY PROCESS or OBTAINING eAsns FOR HEATING PuRrosEs.

No Drawing.

'1 b all whom it may concern.

Be it known that I, EMIL KNonvnnAeEp, a subject of the. German Emperor, and resident of Heidelberg, Germany, have invented yet been based on this process, because there 1 were not suitable sources of cheap, centage carbonic acid. 1

It has not hitherto been known to utilize the carbonic acid of the smoke gases for firing with carbon monoxid and to recuperate the carbonic acid by a cyclic operation. The present process is based on the absorptlon of the carbonic acid from .smoke in high pera any known manner either chemical or mechanical, for instance by means of carbonates or of water, the carbonic acid extracted containing a high'percentage of CO and then being used to gasify at high temperatures fuels carbon. The gases thus obtained consisting mostly of carbon monoxid are then used for heating purposes and in firing installations, working under pressure if needs be, thereby again forming smoke gases containing carbonic acid, about 50 percent. of which are again used in the cyclic operation.

' The process presents the advantage that considerable amounts of pure carbonic acid (the remaining 50 percent.) can be extracted for liquefaction for known the operation of motors or the like.

The process is especially economical as it is possible in recovering the carbonic acid from the smoke gases, to wash out'at the same time by suitable washing processes the compounds of nitrogen and oxygen pro- ,duced in the combustion of moted by the cooling effect which the heat- Specification of Letters Patent.

'various ways for containing a high percentage of purposes, such for instance as the production of cold,

carbon monoxid, vthe formation of which compounds 1s pro- Patented Apr. 11, 1916;

i Application filed September 15, 1913. Serial No. 789.922.

ed surfaces exercise on the gases that are bemg burnt in the firing installations.

The carbonic acid obtained from the smoke gases can in this process be used in the gasification of 'the fuels contalnmg carbon, for instance'the carbonic acid can be led under the shaft of ,a producer furnaceand utilized for increasing the content of carbon gases. In this manner it is possible to simultaneously obtain in consequence of the endothermic character of the process, a reduced temperature in the producer furnaces and an extension of the firing zone, thereby increasing the duration of the producers. The gas thus produced. corresponds to a mixed gas in'which instead of steam, car- I bonic acid wlth air have been simultaneously introduced into the producer, forming an enriched producer gas.

Almost pure monoxid of carbon is obtained if the carbonic acid is, as in the water I gas process, so employed that a'hot blowing and a subsequent cold blowing take place periodically in the reducer furnace, the re sulting gases being collected separately, whereby in the first phase (as in the water gas process) producer gas will be formed, while in bon monoxid (in lieu of water gas) is produced. This process can also be carried "out even under pressure in. apparatus heated in any suitable manner for the permanent production of almost pure carbon monoxid. The combustlon of the carbon monoxid gases thus produced is preferably effected in accordance with gas firing'under pressure, for

the purpose of securing a better mixing of the gases and a more rational heating together with an increased yield of compounds of nitrogen and oxygen, without, if needed, allowing the gases to partly, or fully, expand during their combustion. f

From the products of combustion of these carbon monoxid gases, the compounds of nitrogen and oxygen are obtained in any suitable manner for instance by cooling or in washing apparatus in the usual manner, for instance by washing with water, or both methods. I

After the compounds of oxygen and nitrogen have been separated out from the smoke gases, effected in the usual manner, preferably in monoxid in theproducer I the second phase almost pure car-- the extraction of the carbonic acid is so I 9o special washing apparatus, for instance with a solution of potassium carbonate. From the lye saturated with carbonic acid,

ner for instance: by heating, and thereupon used afresh in the cyclic operation for gasifying fuel, or,--if desired, it is liquefied after being suitably purified and dried.

A special advantage of the process in accordance with this invention lies in the'fact that the smoke gases do not reach the atmosphere until after they have been purified. What I claim is- 1. The cyclic process of obtaining heating gases which consists in gasifying carboncontaining fuels by means of carbon dioxid, thereby forming carbon monoxid, burning the carbon monoXid with air, recovering the compounds of nitrogen and oxygen from the products of combustion, then recovering the carbon dioXid from such products of combustion, and agaln passing a portion of the the latter is recuperated in the known man compounds of separated carbon dioxid over the heated carbon-containing fuel.

2. The cyclic process of obtaining heating ""gases which consists in gasifying carboncontainim fuels by means of carbon dioxid, thereby orming carbon monoxid, burning the carbon monoXid with air, recovering the nitrogen and oxygen from the products of combustion, then recovering the carbon dioxid from such products of combustion as a'carbonate, recuperating the carbon dioxid from the carbonate and thereupon passing it over heated carbon-containing fuel.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

' EMIL KNOEVENAGEL.

Witnesses JULIAN Burs,

' KARL MELSCHNIGLE. 

